DATACMNS-1359 - Improved exception message for missing accessors and getters.

The exception messages used in the PersistentProperty.getRequired(Getter|Setter|Field)(…) now mention the name of the property that's offending.

src/main/java/org/springframework/data/mapping/PersistentProperty.java

@@ -97,7 +97,7 @@ public interface PersistentProperty<P extends PersistentProperty<P>> {
 		Method getter = getGetter();
 
 		if (getter == null) {
-			throw new IllegalArgumentException("No getter available for this persistent property!");
+			throw new IllegalArgumentException(String.format("No getter available for persistent property %s!", this));
 		}
 
 		return getter;
@@ -117,7 +117,7 @@ public interface PersistentProperty<P extends PersistentProperty<P>> {
 		Method setter = getSetter();
 
 		if (setter == null) {
-			throw new IllegalArgumentException("No setter available for this persistent property!");
+			throw new IllegalArgumentException(String.format("No setter available for persistent property %s!", this));
 		}
 
 		return setter;
@@ -131,7 +131,7 @@ public interface PersistentProperty<P extends PersistentProperty<P>> {
 		Field field = getField();
 
 		if (field == null) {
-			throw new IllegalArgumentException("No field backing this persistent property!");
+			throw new IllegalArgumentException(String.format("No field backing persistent property %s!", this));
 		}
 
 		return field;

src/main/java/org/springframework/data/mapping/model/Property.java

@@ -64,7 +64,8 @@ public class Property {
 		);
 		this.hashCode = Lazy.of(() -> withFieldOrDescriptor(Object::hashCode));
 		this.name = Lazy.of(() -> withFieldOrDescriptor(Field::getName, FeatureDescriptor::getName));
-		this.toString = Lazy.of(() -> withFieldOrDescriptor(Object::toString));
+		this.toString = Lazy.of(() -> withFieldOrDescriptor(Object::toString,
+				it -> String.format("%s.%s", type.getType().getName(), it.getDisplayName())));
 
 		this.getter = descriptor.map(PropertyDescriptor::getReadMethod)//
 				.filter(it -> getType() != null)//

src/test/java/org/springframework/data/mapping/model/AnnotationBasedPersistentPropertyUnitTests.java

@@ -239,6 +239,39 @@ public class AnnotationBasedPersistentPropertyUnitTests<P extends AnnotationBase
 		assertThatThrownBy(() -> property.getRequiredAnnotation(Transient.class)).isInstanceOf(IllegalStateException.class);
 	}
 
+	@Test // DATACMNS-1359
+	public void missingRequiredGetterThrowsException() {
+
+		SamplePersistentProperty property = getProperty(Sample.class, "field");
+
+		assertThatExceptionOfType(IllegalArgumentException.class) //
+				.isThrownBy(() -> property.getRequiredGetter()) //
+				.withMessageContaining("field") //
+				.withMessageContaining(Sample.class.getName());
+	}
+
+	@Test // DATACMNS-1359
+	public void missingRequiredSetterThrowsException() {
+
+		SamplePersistentProperty property = getProperty(Sample.class, "field");
+
+		assertThatExceptionOfType(IllegalArgumentException.class) //
+				.isThrownBy(() -> property.getRequiredSetter()) //
+				.withMessageContaining("field") //
+				.withMessageContaining(Sample.class.getName());
+	}
+
+	@Test
+	public void missingRequiredFieldThrowsException() {
+
+		SamplePersistentProperty property = getProperty(NoField.class, "firstname");
+
+		assertThatExceptionOfType(IllegalArgumentException.class) //
+				.isThrownBy(() -> property.getRequiredField()) //
+				.withMessageContaining("firstname") //
+				.withMessageContaining(NoField.class.getName());
+	}
+
 	@SuppressWarnings("unchecked")
 	private Map<Class<? extends Annotation>, Annotation> getAnnotationCache(SamplePersistentProperty property) {
 		return (Map<Class<? extends Annotation>, Annotation>) ReflectionTestUtils.getField(property, "annotationCache");
@@ -410,4 +443,9 @@ public class AnnotationBasedPersistentPropertyUnitTests<P extends AnnotationBase
 	@interface CustomReadOnly {
 
 	}
+
+	interface NoField {
+
+		String getFirstname();
+	}
 }